11.   Police say the blast was caused by a suicide bomber, who entered a hotel in the seaside resort of Netanya, and detonated an explosive device.

12.   Reports from the city in northern Afghanistan said the blast was caused by a grenade, which a local official called an act of terrorism.

13.   Russian television said the Federal Security Service had determined that the blast was caused by a bomb in a satchel placed near an underground kiosk.

14.   Seven months after the explosion, federal investigators have still not determined whether the blast was caused by a bomb, a missile, or a mechanical failure.

15.   The army said the blast was caused by a bomb.

16.   The blast caused Hampton to drift off the mound, turn toward center and cringe.

17.   The spokesman, Larry Trotter, said he was as baffled as the federal agents about what caused the blast.

18.   They gave no indication that a specific individual or group is suspected of causing the blasts.

19.   Throughout the day Thursday, investigators pored through the smoking wreckage of the gutted apartment building in southeastern Moscow, searching for clues as to what caused the blast.

20.   Two ships, one loaded with explosives, collided in Halifax Harbor, causing the blast that could be heard for miles and killed or injured thousands.